Switching to synthetic oil. 355 rebuild
#1
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After the rebuild I ran valvoline 10w-50 for about 20 miles, drained it and replaced it with 5w-30 joe gibbs break in oil. I now have about 500 miles and I am going to change the oil next week before I hit the dyno. Should I stick with 10w-30 conventional for awhile longer? or is it time to use 5w30 mobil 1 synthetic?
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It's my understanding that after motors are broken in it's o.k. to use synthetic oil. I've only heard not to use synthetic during break-in; I'm sure you know that synthetic oil would prevent the rings from breaking in and sealing properly. If you're sure your motor is broken in I don't see a problem with synthetic...
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